For reasons of hygiene, many components or
products in the medical engineering industry are manufactured as disposables. A
wax guard is a disposable component used in hearing aids. When the guard
becomes excessively soiled, it is simply replaced. There is a very thin
membrane welded to the outer ring of the component. In this case, the mask
welding technique is used. In comparison to a euro coin, the components are
very small and the width of the welding seam is no more than 0.2 mm.